检索结果-南通市图书馆

Interfacial electron rearrangement of 3D Fe_(3)O_(4)/h-yFeO_(3)composites for efficient electromagnetic wave absorption

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 609-618页

作者： yi Sui yingde zhang Guang liu Lei Ji Junyu yue Chen Wu Mi yan School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China Key Laboratory of Rare Earths Chinese Academy of SciencesGanzhou 341119China Shanxi-zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China

Interface modulation is an important pathway for highly efficient electromagnetic wave ***,tailored interfaces between Fe_(3)O_(4)particles and the hexagonal-yFeO_(3)(h-yFeO_(3))framework were constructed via facile *** resulting interfa-cial electron rearrangement at the heterojunction led to enhanced dielectric and magnetic loss *** results and density function theory(DFT)simulations demonstrate a transition in electrical properties from a half-metallic monophase to metallic Fe_(3)O_(4)/h-yFeO_(3)composites,emphasizing the advantages of the formed *** transformation of electron behavior is also accompan-ied by a redistribution of electrons at the Fe_(3)O_(4)/h-yFeO_(3)heterojunction,leading to the accumulation of localized electrons around the y-O-Fe band bridge,consequently enhancing the polarization.A minimum reflection loss of-34.0 dB can be achieved at 12.0 GHz and 2.0 mm thickness with an effective bandwidth of 3.3 GHz due to the abundant interfaces,enhanced polarization,and rational ***,the synergistic effects endow the Fe_(3)O_(4)/h-yFeO_(3)composites with high performance and tunable functional properties for efficient electromagnetic absorption.

关键词： self-assembling heterojunction electron rearrangement interface modulation electromagnetic wave absorption

Palaeowind reconstruction from Lower Cretaceous wavedominated depositional records of the Tanan Depression,Northeast Asia

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2025年第1期43卷 41-56页

作者： Xinyu XUE zaixing JIANG Chao liu Li WANG Huanyu XIE Lizhou SONG Ming SU School of Marine Science Sun Yat-sen UniversityZhuhai 519083China School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Sinopec Matrix Corporation Qingdao 266000China Daqing Oilfield Production Technology Institute Daqing 163453China

Palaeowind regime is an important component for reconstructing palaeoclimate and understanding ancient global *** applied the beach-ridge thickness technique(BTT)and the longshore-bar thickness technique(LTT)to reconstruct the Early Cretaceous palaeowind velocities based on depositional records of Tanan Depression in Northeast *** thickness of beach ridges and nearshore bars is the most important parameter for applying the BTT and the LTT *** identified 22 beach ridges and 23 nearshore bars based on drilling cores and wireline-log data in the Tanan *** velocities calculated by using the LTT method ranged from 10.84 to 13.66 m/s,showing a narrower range than those calculated by using the BTT method(7.58–15.93 m/s).We further analyzed the underlying factors causing the difference between the results derived from these two methods based on the sedimentary process of the beach ridge and the nearshore *** reconstructed wind regime was assumed to be the summer monsoon originating from the Mongol-Okhotsk Ocean before it had been completely enclosed,which provides valuable insight into the understanding of the atmospheric circulation in Northeast Asia during the Early Cretaceous.

关键词： palaeowind beach ridge nearshore bar Early Cretaceous East Asia Summer Monsoon

Numerical Modeling and Analysis of Grooved Surface Applied to Film Cooling

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2011年第4期8卷 464-473页

作者： L. Guo z. C. liu y. y. yan z. W. Han Faculty of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal Combustion Engine Jilin University Changchun 130022 P. R. China Key Laboratory of Bionic Engineering （Ministry of Education China） Jilin University Changchun 130022 P. R. China

In order to improve the efficiency of film cooling, numerical investigation was carried out to study the effects of different film-cooled plates on surface heat transfer. Both grooved and non-grooved surfaces were concerned. The modeling was per- formed using Fluent software with the adoption of Shear-Stress Transport （SST） k-ωmodel as the turbulence closure. The coolant was supplied by a single film cooling hole with an inclination angle of 30°. The Mach numbers for the coolant flow and the mainstream flow were fixed at 0 and 0.6, respectively. At three blowing ratios of 0.5, 1.0 and 1.5, the aerodynamic behaviour of the mixing process as well as the heat transfer performance of the film cooling were presented. The numerical results were validated using experimental data extracted from a benchmark test. Good agreements between numerical results and the ex- perimental data were observed. For the film cooling efficiency, it shows that both local and laterally averaged cooling effectiveness can be improved by the non-smooth surface at different blowing ratios. Using the grooved surface, the turbulence intensity upon the plate can be reduced notably, and the mixing between the two flows is weakened due to the reduced turbu lence level. The results indicate that the cooling effectiveness of film cooling can be enhanced by applying the grooved surface.

关键词： film cooling non-smooth surface cooling effectiveness grooved structure blowing ratio

CALCULATION OF THE DAMPING OF THE zn-27Al ALLOy BASED ON THE MICRO INTERFACE SLIDING MODEL

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 228-234页

作者： y.z. zhao Q. Gao y.C. liu School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Department of Applied Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

The microstructures of the zn-27Al alloy after modification, solid-solution treatment, and natural aging were studied. It was clarified why the damping properties of zn-27Al alloys, after treatment, had advanced most on the basis of analyzing the microstructures. Approximate expressions have been educed, which can be used to quantificationally work out the damping of the zn-27Al alloy on the basis of the micro interface sliding model. By comparing the testing damping properties of the foundry zn-27Al alloys and the zn-27Al alloys after modification, solid solution, and natural aging, it was shown that the expressions were rational.

关键词： modification solid solution and aging damping micromechanism micro interface sliding model

月球钛铁矿原位分选富集多物理场仿真与优化分析

在线全文

学校读者我要写书评

暂无评论

中国科学:地球科学 2025年第1期55卷 194-206页

作者：张鹏刘欣刘光辉代巍杨瀚哲郑海菠王之牛冉白一帆张阳刘成保杨格杨军伟张光中国科学院空间应用工程与技术中心北京100094 北京合工仿真技术有限公司北京100089

月球资源的探测与利用已成为未来月球探测任务的主要目标.月球矿物的分类采集与处理是月球资源原位探测与利用的基础前提.本文提出了一种基于干式磁选法的月壤磁性矿物原位分选富集方案,通过改变不同磁性特征月壤颗粒的运动轨迹实现磁... 详细信息

月球资源的探测与利用已成为未来月球探测任务的主要目标.月球矿物的分类采集与处理是月球资源原位探测与利用的基础前提.本文提出了一种基于干式磁选法的月壤磁性矿物原位分选富集方案,通过改变不同磁性特征月壤颗粒的运动轨迹实现磁性矿物从月壤中分离.我们对该干式磁选装置进行了详细建模,对磁性参数的三维分布特征进行了有限元计算和分析.基于嫦娥五号样品的表征与分析结果,进一步开展月壤颗粒形貌和物理特征的建模与仿真模拟.最后,对月壤颗粒多物理场作用下的运动过程进行了离散元仿真分析,研究了关键参数对月壤中钛铁矿富集性能的影响.结果表明,在特定的磁场强度和滚筒转速下,可有效实现月壤中钛铁矿的分选富集.此外,还研究了月球弱重力和月壤颗粒带电特性对富集过程的影响,结果表明弱重力作用和带电特性均能有效促进钛铁矿的富集过程.本研究验证了干式磁选法用于月壤钛铁矿富集的可行性,为月球矿物资源的开采、处理和利用等科学任务的实施提供了理论基础.

关键词：月壤原位资源利用磁选分选富集

Stable partial nitrification was achieved for nitrogen removal from municipal wastewater by gel immobilization:A pilot-scale study

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第5期151卷 529-539页

作者： Xin Hu Hong yang Xiaoyue Fang Xuyan liu Jiawei Wang Xiaotong Wang yongsheng Bai Bojun Su Key Laboratory of Beijing for Water Quality Science and Water Environmental Recovery Engineering Faculty of ArchitectureCivil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China Beijing General Municipal Engineering Design&Research Institute Co. Ltd.Beijing 100044China Hebei GEO University Shijiazhuang 050031China Hebei Key Laboratory of Water Quality Engineering and Comprehensive Utilization of Water Resources Hebei University of ArchitectureZhangjiakou 075000China School of Environmental Science and Safety Engineering Tianjin University of TechnologyTianjin 300384China Beijing Drainage Group Co.Ltd. Beijing 100022China

As an energy and carbon saving process for nitrogen removal from wastewater,the partial nitrification and denitrification process(PN/D)has been extensively ***,achieving stable PNinmunicipalwastewater has always been *** this study,a gel immobilized PN/D nitrogen removal process(GI-PN/D)was established.A 94 days pilot-scale experiment was conducted using real municipal wastewater with an ammonia concentration of 43.5±5.3mg N/L at a temperature range of 11.3–28.7◦*** nitrogen removal performance and associated pathways,shifts in the microbial community as well as sludge yield were *** results were as follows:the effluent TN and COD were 0.6±0.4mg/L and 31.1±3.8 mg/L respectively,and the NAR exceeding 95%.GI-PN/D achieved deep nitrogen removal ofmunicipalwastewater through stable PN without taking any *** primary pathways for nitrogen removal were identified as denitrification,simultaneous nitrification-denitrification,and aerobic ***-throughput sequencing analysis revealed that the immobilized fillers facilitated the autonomous enrichment of functional bacteria in each reactor,effectively promoting the dominance and stability of the microbial *** addition,GI-PN/D had the characteristic of low sludge yield,with an average sludge yield of 0.029 kg SS/kg *** study provides an effective technical for nitrogen removal from municipal wastewater through PN.

关键词： Gel immobilization Partial nitrification Deep nitrogen removal Autonomous enrichment Sludge yield

RELIABILITy ANALySIS FOR AN AERO ENGINE TURBINE DISK UNDER LOW CyCLE FATIGUE CONDITION

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 514-520页

作者： C.L.liu z.z.Lü y.L.Xu School of Aviation Northwestern Polytechnical University Xi'an 710072 ChinaSchool of Aviation Northwestern Polytechnical University Xi'an 710072 ChinaChina Aviation Research Institute 608 Zhuzhou 412002 China

Reliability analysis methods based on the linear damage accumulation law (LDAL) and load-life interference model are studied in this paper. According to the equal probability rule, the equivalent loads are derived, and the reliability analysis method based on load-life interference model and recurrence formula is constructed. In conjunction with finite element analysis (FEA) program, the reliability of an aero engine turbine disk under low cycle fatigue (LCF) condition has been analyzed. The results show the turbine disk is safety and the above reliability analysis methods are feasible.

关键词： low cycle fatigue life reliability analysis load-life interference model recurrence method aero engine turbine disk

ARF4 acting upstream of LBD16 promotes adventitious root formation in peach

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2025年第1期11卷 145-161页

作者： Jingjing liu Lingling Gao Ruoxi zhang Anqi Gao zamith Kerubo Oginga Beibei zheng yuepeng Han CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenThe Innovative Academy of Seed Design of Chinese Academy of SciencesWuhanHubei 430074China Hubei Hongshan Laboratory WuhanHubei 430070China University of Chinese Academy of Sciences Beijing 100049China

Although class A auxin response factors(ARFs)are known to regulate adventitious root(AR)development through the canonical SCFTIR1-Aux/IAA-ARF signaling pathway,the regulatory role of class B ARFs in AR development remains largely ***,this research focused on the role of class B ARF transcription factors in peach(Prunus persica‘Shengli')adventitious root ***,we report the role of a class B ARF gene Pp ARF4 in adventitious root formation in *** transcriptome and q RT-PCR analyses showed that the transcription of Pp ARF4 was significantly up-regulated in auxin-treated stem explants.y2H assay showed that Pp ARF4 had no interaction with Pp IAAs(AUXIN/INDOLE ACETIC ACIDs).Pp ARF4 could bind the promoters of lateral root development gene Pp LBD16 and auxin transport gene Pp PIN1 to activate their *** overexpression of Pp ARF4 and Pp LBD16 in Arabidopsis promoted AR ***,Pp ARF4 could act as a negative regulator of flavone synthesis and thus prevent the explants from *** results not only provide novel insights into the functions of ARFs in regulating plant growth and development,but will also be useful for fulfilling asexual propagation by stem cuttings in peach.

关键词： Prunus persica Adventitious root Auxin Pp ARF4 Pp LBD16

Beyond Performance of Learning Control Subject to Uncertainties and Noise: A Frequency-Domain Approach Applied to Wafer Stages

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 198-214页

作者： Fazhi Song Ning Cui Shuaiqi Chen Kai zhang yang liu Xinkai Chen Jiubin Tan IEEE the Center of Ultra-precision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of Ultra-Precision Intelligent Instrumentation Ministry of Industry and Information Technology the State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of Technology the Center of Ultraprecision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of UltraPrecision Intelligent Instrumentation Ministry of Industry and Information Technology the Department of Electronic and Information Systems Shibaura Institute of Technology

The increasingly stringent performance requirement in integrated circuit manufacturing, characterized by smaller feature sizes and higher productivity, necessitates the wafer stage executing a extreme motion with the accuracy in terms of nanometers. This demanding requirement witnesses a widespread application of iterative learning control(ILC), given the repetitive nature of wafer scanning. ILC enables substantial performance improvement by using past measurement data in combination with the system model knowledge. However, challenges arise in cases where the data is contaminated by the stochastic noise, or when the system model exhibits significant uncertainties, constraining the achievable performance. In response to this issue, an extended state observer(ESO) based adaptive ILC approach is proposed in the frequency *** being model-based, it utilizes only a rough system model and then compensates for the resulting model uncertainties using an ESO, thereby achieving high robustness against uncertainties with minimal modeling effort. Additionally, an adaptive learning law is developed to mitigate the limited performance in the presence of stochastic noise, yielding high convergence accuracy yet without compromising convergence speed. Simulation and experimental comparisons with existing model-based and data-driven inversion-based ILC validate the effectiveness as well as the superiority of the proposed method.

关键词： Extended state observer learning control model uncertainties motion control stochastic noise